Ur idiots u can bann me for 1 year lolollol u huge idiots i hate u i wish games where here but t
Stupid ReeliChat just wont let us have games

They essentially have to make a game engine to create games, then add multiplayer, integrate it with website to gather avatars and usernames, and then implement some form of anti-cheat. Then after that's all done extremely heaving testing/stress testing is required.

Adding games is a lot harder than typing "add games"